Support area (upslope area) thresholdbased on break point of log-log plot of slopevs contributing area. Breakpoint corresponds with spatial transition from convexhillslopes to concave valleys.Can be difficult to set a single threshold for a networkthat spans significantly heterogeneous terrain.

Dispersion limited to 2 cells. The question that is not being asked: DEM = Digital Elevation Model Spatially HeterogeneousVariables vs. Lumped quantity (Beven and Kirkby 1979) What happens upstream matters. Mean basin storage deficit based on lumped water balance (precipitation, evapotranspiration, outflows) at successive time steps. When is a grid cell part of a stream? Slope ∝ 1/Contributing Area (Seibert and McGlynn 2007) Future Work: